Abrasive carrier for cylinder grinding tools



Oct. 18, 1932. H. w. ZIMMERMAN ABRASIVE CARRIER FOR CYLINDER GRINDING TOOLS Fi led uarh 25, 1929 Gavan/ 02% WWII/larval,

Patented Oct. 18, 1932 UNITED STATES PATENT 'OFFICE .MAIN'IENANCE MACHINERY CO.,

ILLINOIS OF CHICAGO, ILLINOIS, A CORPORATION OF ABRASIVE CAlRRIER FOR CYLINDER GRINDING TOOLS Applicationjiled March 25, 1929. Serial No. 349,613.

My invention has to do with the abrasive carriers for abrading tools such as may be used in the grinding of engine cylinders, and it has to do particularly with a novel arrangement for detachably securing the abrasive element to the carrier. 7

One form of tool which has been used heretofore and to which my invention is readily adaptable is that wherein a plurality of abrading stones are supported by carriers mounted in a cage-like body and arranged for radial adjustment during the grinding operation. In such form of tool, the abrading stone is usually mounted in a channeled part of its carrier in such a way that it may be removed when desired to substitute a new stone. Heretofore, it has been customary to secure the stone in its channel by means of a plurality of small set screws which pass through one of the channel sides with their inner ends engaging the stone-holder. These set screws are quite short and small in diameter with the result that only a few threads are engaged to secure the stone in place. 1 These small clamping screws, consequently,

tend to work loose very quickly, loosening the stones in the carriers causing chatter and inaccurate work and permitting the stones to shift lengthwise of their carriers with the result that an uneven abrading action may take place. Frequently one or more of these screws become loosened to such an extent during the grinding operation that they fall into the cylinder and injure such cylinder.

It is quite important that the stones be held rigidly in the carrier during the grinding operation. 7

It has also been found that it is quite difficult to handle and fasten the small set screws in place, thereby rendering the arrangement as a whole quite inconvenient and causing unnecessary delay in changing the stones as re uired due to wear, etc.

ne of the objects of my invention is to overcome all of the foregoing objectionable features and to provide a simple, inexpensive and positive-acting clamp means for rigidly securing and holding the abrading stones seated in their respective carriers.

A further object is to provide an arrangement wherein long-threaded clamp screws of greater cl1ameter may be employed so that once said screws and clamps have been set up to hold the stones in place, the likelihood of then becoming loosened in operation is reduced to a minlmum.

An additional object is to provide for more readily and quickly replacing and securlng the stones in their respective carriers.

Other ob ects and advantages will become apparent as this description progresses and by reference to the drawing wherein,-

igure 1 1s a View, partially in section, of one form of abrading tool embodying my invention;

Fig. 2 is a separated elevational view of one of the stone carriers, of the structure of Fig. 1, embodying my invention;

F 1g. 3 1s an edge-wise'elevational view of the carrier with the abrading stone and clamp means omitted;

Fig. 4 is a horizontal section taken substantlally on line 4-4: of Fig. 2'

1g. 5 is a horizontal section taken substantlally on line 55 of Fig. 2; and

'F 1g. 6 is a separated sectional view of one of the clamp devices.

In illustrating my invention, I have shown a form of cylinder grinding mechanism which comprises a body 10 of cage-like construction adapted to support a plurality of stone carriers 11 for radial adjustment movement therein. Outward, radial movement of these stone carriers is accomplished by means of a cone-spreader structure (indicated generally at 12) which includes a pair of conespreaders 13, 13, the cone surfaces of which engage complementally tapered surfaces on the inner edges of the stone carriers. The stone carriers 11 are held within the body 10 and against the cone spreaders 13, 13 by means of spring rings 14, 14 engaging their opposite ends, and these spring rings, obviously, aid in the retracting or inward, radial movement of the stone carriers.

Each of the stone carriers support at their outer edges grinding stones 15 which, as wear takes place in the grinding operation, must be replaced. It is, therefore, desirable that these stones not only be rigidly carried by the carriers 11 but also readily detachable therefrom, and this is accomplished as follows: The outer edges of the stone carriers are provided at the opposite sides with metal pieces 16, 16' which are secured to the carrier by a plurality of rivets 17 or other secure fastening means, to form at the outer edge of the carrier a channel 18. The channel pieces 16, 16 are shorter than the carrier body thereby providing for the reception of the spring rings 14, 14 in the grooves 19 at the opposite ends of the carriers. Instead of the foregoing the carrier may be formed of a single piece with its one edge having a channel formed therein to receive the stone or either or both of the channel side pieces may be detachably joined to the carrier body, without departing from my invennon.

In the form illustrated in the drawing, the grinding stones 15 are fixedly mounted, in any desired manner, in a holder 20 which is adapted to reinforce the same against breakage. This stone-holder or reinforcement 20 with its grinding stone is rigidly held seated in the carrier channel 18 y clamp means readily detachable but which is of a character that will not tend to work loose during the grinding operation. Specifically, the carrier channel side piece 16 is preferably provided with two cut-outs 21 which extend a slight distance into the base of the channel, as clearly illustrated at 21 in Fig. 3, so that the stone holder 20 extends out slightly beond the channel base at that point (Fig.5)

ach of these cut-outs is adapted to receive a clamp block 22 which has one part 22 adapted to be mounted in the channel side cut-out and another angularly extended part 22 adapted to extend toward and engage the .body of the carrier 11 as at 11 beyond the inner edge of the channel 18 (Figs. 2 and 5). The shape of the cut-out 21 permits the inner face of the block part 22 of the clamp block to be drawn inwardly to clampingly engage the stone-holder 20, as will be described further hereinafter. The stone holder 20 may not be used, or loose strips corresponding to the sides of the holder 20 may be used, but in such cases, the clamp block will engage either the stone itself or the loose strips, as the case may be, wlthout departing from myl invention.

-Each of t e clamp blocks is adapted to be clamped in place by means of a long, relatively'large diameter screw 23 which passes freely through an opening 24 in the clamp block part 22, through a threaded opening 25 in the carrier 11, and threaded openings 26 in the channel parts 16, 16 (Fig. 5) thereby providing a long threaded bearing for said screw whereby the clamp screws will not be liable to loosen in the ordinary use of the tool and the clamp block will be rigidly held in place. The clamp block 22 is countersunk to receive the head of the screw 23 which is of conventional taper, to provide an increased friction-holding surface, which further tends to guard against loosening of the clamp means.

The opening 24 in the clamp block through which the screw 23 passes is substantially in the central portion of the clamp part 22 with the result that as the screw 23 is tightened in place the part 22* of the clamp block moves about its angular carrier-body engaged part 22 in such a way that the clamp block body is moved inwardly against the stone holder 20 thereby pressing and holding the latter seated in the carrier channel.

The advantages of my invention will be readily understood from the foregoing. The clamp screws 23 are of suiiicient size that they may be readily handled and they may be quickly applied and drawn into secure clamping position. This enables one to more quickly change the abrading stones. Further, the abrading action will be true and uniform due to the positive seating of the stones in the carrier and the avoidance of the hereinabove described loosening and other detrimental features.

While I have shown only one form of my invention, it will be understood that other changes in details and arrangement of parts may be made therein without departing from the spirit and scope of my invention as defined by the following claims.

I claim:

1. In a tool of the character described, a carrier having a body with a receiving-channel formed therein, an abrading stone unit mounted in said channel, and means for rigidly securing said abrading stone unit in said channel which includes a clamp block adjustably mounted on said body and being so arranged as to extend into one of the sides of said channel to engage said unit, and separate fastening means for tightening said block in place to wedge said abrading stone unit downwardly seated in said channel.

2. A carrier for a tool of the character described, which comprises a body part having means forming a channel along one edge with a cutout in one of the channel sides, and means for securing an abrading stone unit in said channel which includes an L-shaped clamp member mounted in a cut-out in one of the sides of said channel, with its L-stem part adapted to engage said stone unit and its L- base part adapted to engage said carrier body inwardly of said channel, and a fastening device passing through the L-stem part of said clamp member and engaging said body whereby as said device is tightened said clamp member is rocked inwardly to engage and clamp said stone unit in seated position in said channel.

3. In a carrier of the character described,

a body having a channel along one edge adapted to receive an abrading stone, one of the sides of said channel having a recess therein, a clamp member having one part seated in said recess with one end adapted to engage said stone and another part extending at substantially right angles from adjacent the other end of said first part and engageable with said body, and a fastening device passing freely through said one part and engaging said body whereby as said device is tightened the said one end of said one part is rocked inwardly to engage and force and hold said stone pressed downwardly and seated in the base of said channel.

I. In a carrier of the character described, a body having a channel formed in its part adjacent the surface to be treated and adapted to receive an abrasive element, one of the sides of said channel having an opening therethrough, a clamp member having one part seated in said opening and engageable with said element and another part extending at an angle to said first part and engageable with said body rearwardly of said channel, and a fastening device passing freely through said clamp member and threadedly engaging said body whereby as said device is tightened said one part of the clamp-member is rocked inwardly about said other part of said clamp member.

5. In a carrier for a tool of the character described, a body having means forming a channel, one of the sides of which channel has one or more openings therethrough, abrasive means mounted in said channel, means for securing said abrasive means in said channel including a clamp member for each said opening, each said clamp member having one part adjustable through its respective opening to engage said abrasive means and having another angularly disposed part engaging said body, and a fastening device passing through said securing means and engaging said body, said one part when fastened being adapted to exert pressure on said abra-. sive means to hold the latter on its channel seat.

6. In a carrier for a tool of the character described, a body having means forming thereon a channel having a base wider than said body, an abrasive element mounted in said channel, one of the sides of said channel having a cut-out providing an opening therein, said cut-out also extending into the channel base, a clamp block mounted in said channel cut-out and engageable with said abrasive element an angularly-disposed extension on said block engageable with said channel having one or more cut-outs therein, a clamp block mounted in each said cut-out, each said block having one part disposed in its respective cut-out, and another angular part thereof extending beyond'the cut-out and engaging said body, said body channel part, body and block having aligned open ings, and a long and relatively large diameter threaded fastening device passing freely through said block opening and threadedly engaging said body and channel part openings.

8. In a tool of the character described, a carrier body having means forming a channel therein, an abrading element mounted in said channel, a part of said channel-forming means being L-shaped and detachably mounted, and means for securing said part and adjusting it in place to clampingly engage the abrading element to hold the same ti 'htly engaged in its carrier channel, said latter means including a fastening device engaging the longer L-leg of said part and said body.

9. In a carrier of the class described, a body having a channel along one edge adapted to receivea unit adapted to engage the cylinder wall surface, one of the sides of said channel having a recess therein, a clamp member disposed in said recess and having one part with its end adapted to engage said unit and another part extending at substantially right angles to said first part and engageable with said carrier body inwardly of said channel, and a fastening device passing through said clamp member and engaging said body whereby as said device is tightened the unitengaged end of said clamp member is rocked inwardly to engage and hold said unit seated in the base of said channel.

10. In a carrier of the class described, a body having a channel along one edge adapted to receive a unit adapted to engage the cylinder wall surface, one of the sides of said channel having a recess therein, an L-shaped clamp block mounted in said recess and having one of its ends adapted to engage said unit and its other end adapted to enigage said body inwardly of said channel, and

a fastening device passing through said clamp and threadedly engaging said body for rocking said clamp block about its bodyengaged end into holding engagement with said unit as said fastening device is screwed inwardly.

In testimony whereof, I have subscribed my name.

HERMAN W. ZIMMERMAN.

body behind aid channel and fastening means 

